不锈钢伸缩门望文生义即是不容易生锈的钢材所制，这儿的"不锈"是相对的，不是肯定的是相对于碳钢而言。不锈钢不容易生锈，但不是肯定不生锈，只是在一样条件和环境中，较碳钢而言不容易被腐蚀和生锈。
Stainless
steel telescopic doors are literally made of steel that is not prone to
rusting. The term 'stainless' here is relative, not necessarily
relative to carbon steel. Stainless steel is not prone to rusting, but
it is not certain that it will not rust. However, under the same
conditions and environment, it is less prone to corrosion and rusting
compared to carbon steel.
生锈"真实质是腐蚀或称之为锈蚀，是因为钢铁外表与大气中的氧、水分及其酸、碱、盐等物质发作化学效果或电化学效果而导致的变色或腐蚀称为锈蚀。外表产生的物质是"锈"是铁的氧化物，也叫做物质氧化的进程。"
Rust
is essentially corrosion, also known as rust, caused by chemical or
electrochemical reactions between the surface of steel and oxygen,
water, and their acids, alkalis, salts and other substances in the
atmosphere, resulting in discoloration or corrosion. The substance
produced on the surface is rust, which is an oxide of iron, also known
as the process of material oxidation
不锈钢伸缩门为何不易生锈，这就和铬有着直接的关系了，在基体内参加12.5%以上的铬。在氧化性腐败无能蚀介质中，铬能使钢外表很快地生成一层细密的钝化膜，避免金属基体被损坏。当含铬量在12.5%以上时，就会构成一层细密的不乱的钝化膜，防锈机能发作跃进式的实变，耐锈蚀才能大大增强，这即是为何不锈钢中的含铬量要有12%以上的因素。
Why
stainless steel telescopic doors are not prone to rusting is directly
related to chromium, which is present in the matrix with a content of
more than 12.5% chromium. In an oxidizing and corrosive medium, chromium
can quickly form a fine passivation film on the surface of steel,
avoiding damage to the metal substrate. When the chromium content is
above 12.5%, a fine and orderly passivation film will be formed, and the
rust prevention function will undergo a leap forward transformation,
greatly enhancing the rust resistance. This is why the chromium content
in stainless steel needs to be above 12%.
还有一种办法，即是在不锈钢伸缩门参加铬的一起，再加放适当的Ni、Mo、V等合金元素后，防锈机能较强。
Another
method is to add chromium to the stainless steel expansion door, and
add appropriate alloy elements such as Ni, Mo, V, etc. to enhance its
rust resistance
